Polymer conducting, semiconducting, and charge storing devices; self-assembled and chemically responsive electronic materials, energy-converting materials N-type organic materials are essential for developing practical organic thermoelectric (TE) devices.  Two n-type polymers based on dichlorodithienylethene (ClTVT) were synthesized. Using the two polymers doped with CoCp2 and N-DMBI, respectively, organic thermoelectric devices were prepared and compared. Doping of […]

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Enhanced Molecular Doping for High Conductivity in Polymers with Volume Freed for Dopants We present two new polythiophene isomers, with more separation and lower side chain density on the backbone compared with the typical polythiophenes. The introduction of spacer subunits to separate the side chains improves the accommodation of dopant molecules close to the polymer […]

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The development of high-performance conjugated polymer-based gas sensors involves detailed structural tailoring such that high sensitivities are achieved without compromising the stability of the fabricated devices. In this work, we systematically developed a series of diketopyrrolopyrrole (DPP)-based polymer semiconductors by modifying the polymer backbone to achieve and rationalize enhancements in gas sensitivities and electronic stability […]

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Polymer conducting, semiconducting, and charge storing devices; self-assembled and chemically responsive electronic materials, energy-converting materials Thermoelectric efficiency is proportional to electrical conductivity of a material and the square of the Seebeck coefficient, the voltage obtained per unit temperature difference.  Increasing the Seebeck coefficient has the effect of decreasing the number of mobile charge carriers, lowering […]

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Suhas Eswarappa Prameela was awarded the best poster award at this years 2019 Mach Conference in Annapolis Maryland. Suhas’s research in Tim Weihs’ lab is focused on developing better lightweight armor materials for the US Army. Conventional heat treatment of Magnesium alloys causes long, thin intermetallic particles to precipitate throughout the alloy. These particles are […]

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A collaborative effort between researchers in the United States and Italy has resulted in a novel technique to rapidly assess the boundaries between grains in polycrystalline materials.

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Johns Hopkins engineers have utilized a new method to probe the stoichiometry and stability of protein complexes in biological membranes.

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